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WorksheetsHydraulics Part 03 - Friction and Efficiency
Total questions: 25
Worksheet time: 16mins
The amount of friction depends on the weight of the objects
True
False
color
What helps slow the box as it slides to the bottom of the ramp?
The diagram represents a person using a spring scale to pull a wooden block up a ramp.The plastic straws were placed under the wooden block to
decrease the mass of the block
decrease the amount of friction
increase the gravitational pull of the block
Identify the force between the wheels of the cart and the ground surface that opposes forward motion of the cart
Momentum
Friction
Magnetic
Force
Which force will decrease if the surface of the
ramp is made smoother?
gravity
magnetism
friction
electricity
This type of force resist motion between two surfaces that are in contact with each other
contact
gravity
friction
The wheels and gears of a machine are greased
in order to decrease
potential energy
efficiency
output
friction
Can Friction be an opposing force?
Yes, it slows objects down until they stop
No, it can't stop objects
Sometimes if the object has no mass
The diagram shows a stationary cart on a friction-less surface. Two unequal opposing forces are about to be applied. If the unequal opposing forces are applied to the cart at the same time, what will occur?
The cart will move to the left.
The cart will move to the right.
The cart will alternate between moving left
and right.
The cart will remain stationary.
Which of these explains how friction affects the speed of a moving object?
Friction pushes objects to higher speeds
Friction only affects speed in outer space
Friction can slow down objects until they stop
How much energy is wasted in this diagram?
100 J
75 J
50 J
25 J
What type of energy is the wasted energy from a light bulb?
Thermal
Light
Kinetic
Nuclear
If a roller coaster glides to a hill with 50 J of energy and 150 J of energy is lost to friction and heat. How much energy is wasted?
100 J
200 J
50 J
150 J
A light bulb requires 20 J of electrical energy and converts 16 J to light energy and 4 J of energy is lost to thermal energy. What is the efficiency of the light bulb?
80%
4 J
20 J
16 J
A washing machine uses 250J of electrical energy to produce 125J of useful energy. How efficient is it?
5%
50%
55%
100%
Which bulb is the most efficient?
Filament bulb
LED light
CFL lamp
An iPhone charger coverts 75J of electricty in to 50J of charge and 25J of thermal energy. How efficient is the charger?
10%
100%
33%
67%
